{
  "schema_version": "1.4.0",
  "id": "GHSA-5w4j-f78p-4wh9",
  "modified": "2025-03-21T15:42:03Z",
  "published": "2025-03-21T15:18:28Z",
  "aliases": [
    "CVE-2025-27612"
  ],
  "summary": "Libcontainer is affected by capabilities elevation similar to GHSA-f3fp-gc8g-vw66",
  "details": "### Impact\nIn libcontainer, while creating a tenant container, the tenant builder accepts a list of capabilities to be added in the spec of tenant container. Code can be seen [here](https://github.com/youki-dev/youki/blob/9e63fa4da1672a78ca45100f3059a732784a5174/crates/libcontainer/src/container/tenant_builder.rs#L408) . The logic here adds the given capabilities to all capabilities of main container if present in spec, otherwise simply set provided capabilities as capabilities of the tenant container.\n\nHowever, GHSA-f3fp-gc8g-vw66 was opened on runc mentioning that setting inherited caps in any case for tenant container can lead to elevation of capabilities. For this, they added a fix [here](https://github.com/opencontainers/runc/blob/986451c24e17c8d4be3c454f60b1f7be4af3e8b4/exec.go#L234-L242) where they never set new inherited caps on tenant, and set ambient caps only if original container had inherited caps.\n\nSimilarly crun never sets inherited caps as can be seen [here](https://github.com/containers/crun/blob/3ec6298abd79e144fbf3fa6db90793ff4c0516f9/src/exec.c#L319).\n\n> [!NOTE]\nThis does not affect youki binary itself, as the exec implementation is partially broken and does not pass on the user-provided caps to tenant containers, this is only applicable if you are using libcontainer directly and using the tenant builder.\n\n### Workarounds\n- Do not pass any user-provided capabilities to the tenant builder, in which case no capabilities will be set on tenant.\n- Alternatively you can verify the capabilities of original container and filter the user passed capabilities before setting them on tenant.\n\n### References\n- https://github.com/opencontainers/runc/security/advisories/GHSA-f3fp-gc8g-vw66\n- https://man7.org/linux/man-pages/man7/capabilities.7.html",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "libcontainer"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.3"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/opencontainers/runc/security/advisories/GHSA-f3fp-gc8g-vw66"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/security/advisories/GHSA-5w4j-f78p-4wh9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27612"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/commit/747e342d2026fbf3a395db3e2a491ebef00082f1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/containers/crun/blob/3ec6298abd79e144fbf3fa6db90793ff4c0516f9/src/exec.c#L319"
    },
    {
      "type": "WEB",
      "url": "https://github.com/opencontainers/runc/blob/986451c24e17c8d4be3c454f60b1f7be4af3e8b4/exec.go#L234-L242"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/youki-dev/youki"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/blob/9e63fa4da1672a78ca45100f3059a732784a5174/crates/libcontainer/src/container/tenant_builder.rs#L408"
    },
    {
      "type": "WEB",
      "url": "https://man7.org/linux/man-pages/man7/capabilities.7.html"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-276"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-21T15:18:28Z",
    "nvd_published_at": "2025-03-21T15:15:42Z"
  }
}